It is a 57 mm rear cap on mine (Super Angulon with Compur 00 from 1961).
My Schneider SA 90mm f5.6 I just purchased is huge. 82 mm front filter thread and rear looks to be as big.
Guessing the f/5.6 is substantially larger the the f/8. My f/8 feels like it's made out of plastic - so light.
Did you try measuring it? That's what I'd do. Trace the outline of the lens and the measure what you traced. L
I put the calipers to my 90 f/8 SA lens that has factory slip-on caps to measure the barrel OD sizes; front is 70mm, rear is 57mm.
Once upon a time, you could visit your local camera store and rummage through a drawer full of random lens caps until you find one the right size. Kinda miss those days- most of my lens caps are non-original and came from such sources.
Bookmarks